Reason for this - at first glance - stupid- question is the following:
We migrated (or Novell forced us to) from our low power (two HL DL360 G3 and 2 DL360 g4 one G5) 6.5 Cluster to a very juicy (6xDL360 G8, tons of proccessors) OES 11 cluster. We serve
approx. 1600 - 1700 Clients. Today everything stopped some of the Cluster Nodes didn't respond. This never happend in our old Cluster!
The reason was or IS by "Enterprise" Design:
DMESG: ipv4: Neighbour table overflow. !!!! Are we the only ones in the (small Novell) World who serves more than 1000 Clients???? WHY is there a limitation in the IP Cluster stack???
Did one EVER tested that. Should we better migrate to M$???
ip neigh show | wc -l --> shows 1021 entrys
sysctl net.ipv4.neigh.default.gc_thresh3
net.ipv4.neigh.default.gc_thresh3 = 1024

Means one cluster Node can handle 1024 connections. What if on one Node runs the DNS server? Only 1020 of 1600 Clients get an answer! Cool enterprise solution boys!

VERY angry!